I can understand that you are frustrated, but as long as this site is open to the general public this is going to keep on happenning and we will have to learn how to deal with it. If you want a site where only experts post, you will have to find a closed site where only experts are allowed to post. Politely pointing out to people why their posts do not give enough evidence to be thought reliable is one way to encourage them to become better educated so that they can give more knowledgeable opinions in the future.